Screw-jack



UNITED STATES E. ELLIS AND B. S. BUcKLEroE VEoxBL'RY, MASSACHUSETTS.. l

` e SCREWFJA'GK;

Specification of Letters Patent No. 5,913, dated November 14.-, `1848.Vy i T0 all whom may concern.'

yBe it known that we, FREEMAN ELLIS'an BENJAMIN S. BUCKLEY, of Roxbury,in the county of Norfolk and State of Massachusetts, have made aninvention of'a new and useful Improvement in Screw-Jacks for RaisingHeavy Bodies, Such as Locomotives, Cars, Buildings, &c.; and we dohereby de` clare that the same is fully represented and described in thefollowing specification and accompanying drawings, letters, figures, andreferences thereof. Y

Of the said drawings, Figure '1, denotes a side elevation of ourimproved jackv screw. Fig. 2, a vertical and central section of thesame. Fig. 3, a horizontal, central, and

transverse sect-ion of it.` Fig. 4, isa top' view of the key lever andmovable metallic dog piece which operates in connection with the ratchetor ratchet wheels to be hereinafter described.

In said figures A, represents a long shaft having two male screws B, O,cut ormade upon it as Seen in Fig. 2, one of them being a right threadedscrew, and the other a left threaded one. Said shaft also h-as tworatchet wheels E, F, fixed to and upon its middle part; the teeth of oneof the ratchet wheels being made to stand in one direction, while thoseof the other wheel are made to stand in the opposite direction. Inconnection with each male screw a female screw Gr, made upon the lowerend of a tube H, operates, t-he thread of the said female screw beingmade applicable to that of the male screw on which it works. f

Each tube H, has .a series of any suitable number of points orprojections a, a, &c., extending from its extreme outer end as seen inthe drawings. Each of the said tubes H,'H, works in one of two tubes I,I, whose internal diameter is made to agree with the external diameterof the tube H, in such manner as to allow the tube H, to slide freelyand closely into and out of the tube I. Each of said tubes I, I, isclosed at its bottom or inner end (as seen at b, 6,) with the exceptionof a cylindrical hole made through thebottom and just large enough toreceive the shaft, and permit it to pass through it as seen in Fig. 2.

A cylindrical ring or collar K, K, of an external diameter correspondingwith the internal diameter of the tube I, is placed upon the shaft A,and within each. tube I, as seen in Fig. 2, the said collar or ringbeing lheld n position orconfined/-to the shaft by a round pin L, whichis passed through thek I collarv andv shaft, and ismadeof al'ength equalto vor a little less than vv'the external diameter of the collar. Inorder to put the `said pinyin lplace or .remove itat any time ,1 j, twoholes c, c, areboredv throughoppositej sides of the tube I, Vin linewiththe passage made lthroughthe collar and shaft andfor the receptionof the pin.1 When each collar` vand its pin are adjusted totheir properposi-` vtions the shaft A, willbe not only connectedy l to. thev twotubes I, I, but be free toturn around within them'while they arestation,v`

ary.. The outerend of each tube H, is made toproject over that yofitstube I, as seen at d, d, and each tube I, is made to `extend beyondthe' end` ofthe screw B, -within it as seenin Fig. 2. The' tube I,thusserves to` 'steadyfthej female screw tube H, and thereby prevent anylateral strain on the threads Of the male and female screws within it. YThe two tubes H, and I, of each screw B, operatf froln lateral `strainon the threads ofy the screws which Vwould otherwise occur orfbej likelytotake'place if the screw tube H,"and 1 ing .together prevent 4thoseinjurious effects iscrew'B, were used l.Without any outside or`incloslng tube I, as seen inthe drawings. By employing the two tubes H,VI, inconnection wit-h each screw- B, the 'screws are made 5to operatewith veiylittle or no friction, consequent upon the klateral strain,yors tending ofthevscrew B, and nut tube H,.to

bend laterally when in usefand thus injure enced.

the screw threads, a difliculty' often` experty HavingV thus explainedthe method of conf. i

struc-ting the lifting machinery of the'jack, we now proceedto describethe kpeculiar lever and dog piece and other parts by whichthe shaft' A,and its screws are revolved either,

'in one or the opposite direction as circumstances may require.

The shaft A, has a two collars/N, O, (which play loosely 'on or aroundthe shaft and are arranged outside of the ratchet wheels, kas seen inthe drawings,) two parallel bars P, Q, (extending respectively from thecollars,)V and across circular plate R, united to thebfars P, Q, thewhole being as seen in t-he drawings.4 The frame M,lcontains orcarriesthey'double dog piece S, which is disposed between the two barsP, Q, and works or plays on a vpin or fulcrum T, passes verticallythrough it and n s s 100,@ frame M, composed of Y l f part of the leveror key which lays in they the said two bars P, Q. Two teeth or dogs m,n, stand outfrom that'end of the'dog piece which s immediatel contiguoustothe ratchet wheels,\one of sai teeth being so ar- 2 ranged as to bemade to play into one of the ratchet wheels, while the other is made tooperate in the other ratchet wheel. AV

square head 0,'is made to project form, and make part of, the dog pieceas seen in the drawings. It is f'adapted 'to a keyfor key lever U,whichhas Va square passage or hole made in one end vofrit for thepurpose of receiving the said` square head.. The-'said lever is made topass through a hole bored through the plate or circular piece R,andlof'a sizey or diameter equal to' that of the keyof the said lever. Anotch V, is cut out of the side of the lever or key part thereof, and inthat hole of the plae Bywhen the lever is fitted or placed on the squarehead of the dog piece.

Thesaid notch should be of a sizesuiiicient to allow ofthe movement ofthe dog piece on its fulcrum so-as tocarry or 'cause'to enter one of thetwo dogs `or teeth m, n, between any twoconsecutive teeth ofitsratchet', and

so asto cause thedog to act against one of the said teeth and `therebyturn the ratchet wheel and shaft, when power is applied to the lever inthe proper direction. ',When

that sideofV the key .pieceor key lever which is opposite to the notch,is borne in the opposite direction so as to rest against the side vof lthe passage through the piece R), both of the teeth of the dog pieceshould Vbe moved out of or be out of action upon `their ratchets,"in`

order that the lever and frame M, may be moved around upon the shaft. gWhen next moved in anV opposite direction the notch of the lever willallow the lever to be moved so as to eause one of the teeth to take into'its ratchetV wheel, and sq as, when the lever `is moved further,t`ocause a rotation of the shaft and its screws. By removing the lever fromthe square head of the dog piece, and reversing the lever or turning it180 on its longitudinal axis and again applying it to the square head,the other tooth of the dog piece may be brought into loperation on itsratchet wheel in a similar manner and so as to reverse `the fmotion ofthe screws.

Therefore if we applyv the jack so constructed under a locomotive orheavy body,l we canV readily raise the same or lower it as occasion mayrequire. A jack may be made tof operate with only one male screw B,female screw Gr, tube H, tube I, collar K, two ratchet wheels, frame M,and its dogged piece and lever, applied to a shaft A, b-ut we refer thejack made as represented in the rawings; or with two screwsB, C, andtheir.

adjuncts,jas we obtain thereby and by one movement of the lever doublethe rise or fall of a body acted upon by the jack than can be producedwhen the jack is made with but lone screw B, and in other respects asspeciclaim a simple duplication `of a screw jack y and lever apparatus,but meaning to claim the combination of the two jacks or the double jackwith but one levery apparatus in' the manner asspecied. w i

2. We also claim, the particular mannerin which we construct the keylever, the

frame M, and doggedpiece, so as'to operate togetherfas above explained;that is to say, the said keylever beingfmade with a notch V, and thesaid `frame M, being made with a hole through its end piece R, toreceive said lever and allow itand the dog piece to oper.- ate 'and theother Vparts being constructed an 'applied `together as hereinbefore setL fOIth. 1

\ In testimonyy whereof we have hereto set our signatures this fifthday'ofApril, A. D.

FREEMAN ELLIS. .i

BENJAMIN S. BUCKLEY.A `z

Witnesses R. H.V EDDY, CALEB EDDY.

